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Optimum Nutrition Serious Mass 12lb / 5.5kg (16 Servings) Flavors:Vanilla Built by DrDescription Optimum Nutrition Serious Mass is a high calorie weight gainer which is also high in protein and when taken over time with regular resistance exercise and a balanced diet can help you gain mass and muscle. It also has creatine and glutamine to support Muscle building & recovery, when accompanies with a balanced diet and regular exercise. Who Needs Serious Mass: People with very active metabolism that struggle to gain weight; Athletes or
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